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Re: Sierra Snowpack and Stream Flow Data / Maps

Posted: Sun Apr 14, 2019 5:25 pm
by oldranger
paul wrote:
Mon Feb 18, 2019 5:02 pm
If you are looking for a quick, overall view for the whole range, rather than local detail, the easiest thing from the state is here:
http://cdec.water.ca.gov/snowapp/swcchart.action
This is updated roughly every working day - no weekends or holidays - and gives a quick visual. The default display is the biggest year, the lowest year, and the current year. At the top you can select from a list of years to include in the graph.
I added 2010-2011 to the graph and this year is remarkably similar. Depending on spring and early summer conditions should be similar this summer. If so then expect snow at 11,000 feet thru july in
central and N. sierra.

Re: Sierra Snowpack and Stream Flow Data / Maps

Posted: Mon May 06, 2019 4:06 pm
by rightstar76
Here's another one:

USDA Forest Service Sierra Snow Depth:

https://www.fs.fed.us/r5/webmaps/SierraSnowDepth/

Re: Comparing conditions to past years

Posted: Tue Jun 11, 2019 9:21 pm
by tomba
To compare snow coverage to past seasons we can use MODIS compare view. Example: https://worldview.earthdata.nasa.gov/?c ... 6876822385

This is A-B comparison. B (right) is today, A (left) is 2011-06-21 (another high snow year). Drag the split image slider left and right to compare. Snow coverage is similar on those dates. Click "A" and "B" in the upper-left tabs, and click the up/down year/month/day arrows in lower left to change the A or B date (or drag the slider at the bottom, or use the left-right arrows between the date slider and the date). Scroll down the panel on the left side and click Aqua or Terra tiles to show/hide the approx. 10:00 or 14:00 views for the selected day to pick the clearer image.

We did a trip to that region early July 2011: viewtopic.php?f=34&t=6282&p=45172#p45172.

Re: Sierra Snowpack and Stream Flow Data / Maps

Posted: Tue Jun 11, 2019 10:38 pm
by wildhiker
I've looked at the modis satellite views a lot, but never knew about the comparison mode. That's amazing! Thanks for sharing. And we should all thank our dedicated civil servants who make these great tools available to everyone for free!
-Phil